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《Chinese Journal of Geophysics》 2016-09
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Opposing coils transient electromagnetic method for shallow subsurface detection

XI Zhen-Zhu;LONG Xia;ZHOU Sheng;HUANG Long;SONG Gang;HOU Hai-Tao;WANG Liang;School of Geosciences and Info-physics,Central South University;Hunan 5D Geophyson CO.,LTD;  
Transient electromagnetic method(TEM)is a commonly-used,non-intrusive,geophysical method of measuring the secondary electromagnetic field induced by transient pulse sources.Because of the inherent mutual-induction between TX and RX coils,the measured field always contains the mutual-induction field,which becomes stronger when TX coil becomes smaller and closer to RX coil.It influences the near-surface TEM systems,which utilize small TX coils to effectively resolve the near surface explorations.The mixture of the mutual-induction field with the secondary field at early period leads to a blind region in the shallow surface in TEM exploration.To solve this problem,we applied two concentric and parallel current coils in the TEM system.They are opposing coils,which means the two coils are physically same,but the currents in them are of equal value and reverse directions.The RX coil is equidistant to the two opposing coils.In terms of this special arrangement,the mutual-induction field received at the RX coil is zero,which means that the mutual induction effect is efficiently eliminated.It is quite suitable for small TX coil TEM system aiming at shallow subsurface detection.
【Fund】: 国际海域资源调查与研发“十二五”(DY125-11-R-03);; 深圳市未来产业发展专项(HYZDFC20140801010002);; 海南省科技兴海专项(2015XH07)资助
【CateGory Index】: P631.325
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